Compensation For Line Speed Command Input - Mitsubishi Electric A800 Plus Series Function Manual

Dancer feedback speed control details
Line speed command input signal (X125 signal)
• During speed control, turning ON the Line speed / tension command input (X125) signal enables write and read of the line
speed command value through communication regardless of whether the dancer feedback speed control is valid or invalid.
• The signal is useful for inputting the line speed command value while dancer feedback speed control is invalid, or switching
validity of the dancer feedback speed control without accidentally changing the frequency command value.
• The following table shows the ON/OFF status of the X125 signal and the validity of the available commands.
( : Valid through communication,

Dancer feedback
speed control
Valid
Invalid
• The X125 signal affects the input methods as follows.
Input method affected by the X125 signal
Operation panel
RS-485 communication (Mitsubishi inverter protocol, MODBUS RTU)
Communication option (FR-A8NC, FR-A8ND, FR-A8NCE, FR-A8NP)
PLC function
• To input the X125 signal, set "125" in any of Pr.178 to Pr.189 (input terminal function selection) to assign the function.
NOTE
• If the X125 or X114 signal is used to switch the command from frequency to line speed while the Frequency setting screen is
displayed on the FR-LU08/FR-PU07, the setting screen remains the same. However, when a frequency value is written, the
value is set as a line speed value.
For example, if 60.00 Hz is entered in the Frequency setting screen of the FR-LU08 while the X125 signal is OFF and then
the X125 signal is turned ON before pressing the WRITE key, the Frequency setting screen is still displayed. When the
WRITE key is pressed under this condition, "600.0" is written as a line speed command value.
Line speed command for starting (Pr.622)
• Use Pr.622 Line speed command for starting to set the line speed command for starting operation.
• The line speed command is regarded as zero while the line speed command input value is less than the Pr.622 setting.
• When the line speed command input value reaches or exceeds the Pr.622 setting, the commanded line speed is applied for
operation.
3.5.4

Compensation for line speed command input

Set the following parameters for setting added compensation or override compensation for the line speed command.
Pr. Name
252
Override bias
T050
253
Override gain
T051
Line speed command added
635
compensation value voltage/
R214
current bias
636 Line speed command added
R215 compensation value bias
Line speed command added
637
compensation value voltage/
R216
current gain
66
DANCER FEEDBACK SPEED CONTROL
: Invalid through communication)
×
Validity of setting through communication
X125 signal
status
Line speed command
ON 
OFF ×
Not assigned to

a terminal
ON 
×
OFF
Not assigned to
×
a terminal
Initial value
50%
150%
9999
9999
9999
Frequency command
×

×
×


Input method not affected by the X125 signal
Pulse train input
Analog input
Multi-speed input
FR-A8AX
Parameter
Setting range
Set the bias compensation value for the override
0 to 1000%
function.
Set the gain compensation value for the override
0 to 1000%
function.
Set the converted % of the bias voltage (current) for
0 to 100%, 9999
analog input.
0 to 6553.4 m/min , Set the bias line speed compensation value for
∗1
9999 analog input.
Set the converted % of the gain voltage (current) for
0 to 100%, 9999
analog input.
Description